<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商管理系统</span>
            </div>
            <el-button type="info" @click="loginout">退出</el-button>
        </el-header>
        <!-- 页面主题区域 -->
        <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px':'200px'">
            <dir class="toggle-button" @click="toggleCollapse">|||</dir>
            <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff"
            active-text-color="#409EFF" :unique-opened= "true" :collapse="isCollapse" :collapse-transition="false"
             :router="true" :default-active="activePath">
            <!-- 注释：:unique-opened="true"：表示为是否只保持一个子菜单的展开；可以用第二种方法为 unique-opened默认为true可直接写-->
            <!-- 一级菜单 -->
            <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 注释：这里的 :index="item.id"只接收字符串比接收数值  而item.id是一个数值，所以把:index="item.id"转换用 +''-->
            <!-- 一级菜单的模板区域 -->
                <template slot="title">
                    <!-- 图标 -->
                    <i :class="iconsObj[item.id]"></i>
                    <!-- 文本 -->
                    <span>{{item.authName}}</span>
                </template>
        <!-- 二级菜单 -->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                    <!-- 图标 -->
                    <i class="el-icon-menu"></i>
                     <!-- 文本 -->
                    <span>{{subItem.authName}}</span>
                </template>
            </el-menu-item>
        </el-submenu>
    </el-menu>
        </el-aside>
        <!-- 右侧内容主体 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
  </el-container>
</el-container>

</template>

<script>
export default {
    data() {
        return {
            //左侧菜单数据
            menulist:[],
            iconsObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao' 
            },
            //是否折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:''
        }
    },
    created(){
        this.getMenuList()
        this.activePath=window.sessionStorage.getItem('activePath')
    },
    methods:{
        loginout(){
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
        // 获取所有的菜单
        async getMenuList(){
            const {data:res} = await this.$http.get('menus')
            if(res.meta.status!=200) return this.$message.error(res.meta.msg)
            this.menulist=res.data
            // 显示所有菜单
            // console.log(res)
        },
        // 点击按钮，切换菜单的折叠展开
        toggleCollapse(){
            this.isCollapse = ! this.isCollapse
        },
        // 保存连接的激活状态
      saveNavState(activePath){
          window.sessionStorage.setItem('activePath',activePath)
      }
    }
}
</script>
<style lang="less" scoped>
    .home-container{
    height: 100%;
    }
    .el-header{
        background-color: #373d41; 
        display: flex;
        justify-content:space-between;
        padding-left: 0;
        align-items: center;
        color: #ffffff;
        font-size: 20px;
        > div{
            display: flex;
            align-items: center;
            span{
                margin-left: 15px;
            }
        } 
    }
    .el-aside{
        background-color: #333744;
        .el-menu{
            border-right: none; 
        }
    }
    .el-main{
       background-color:#EAEDF1;
    }
    .iconfont{
        margin-right: 10px;
    }
    .toggle-button{
        background-color: #4A5064;
        padding: 0;
        font-size: 15px;
        line-height: 25px;
        color: #ffffff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>